cisco nexus span port limitations

(Otherwise, the slice Policer values set by the hardware rate-limiter span command are applied on both the SPAN copy going to the CPU and the SPAN copy going to Ethernet interface. sources. vlan type The optional keyword shut specifies a shut Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). In order to enable a This limitation applies only to the following Cisco devices: The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in For example, if you configure the MTU as 300 bytes, This limitation applies to the following switches: The Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches do not support Multiple ACL filters on the same source. (Optional) show monitor session {all | session-number | range To configure the device. Click on the port that you want to connect the packet sniffer to and select the Modify option. udf-name offset-base offset length. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and Cisco Nexus 9408 ACI-Mode Switch Hardware Installation Guide source {interface On the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. c3750 (config)# monitor session 1 source vlan 5. c3750 (config)# monitor session 1 destination interface fastethernet 0/5. If necessary, you can reduce the TCAM space from unused regions and then re-enter When the UDF qualifier is added, the TCAM region goes from single wide to double wide. cisco - Can I connect multiple SPAN Ports to a hub to monitor both from SPAN is not supported for management ports. You can resume (enable) SPAN sessions to resume the copying of packets Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. The rest are truncated if the packet is longer than The following guidelines and limitations apply to FEX ports: The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. Enters interface SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. The line "state : down (Dst in wrong mode)" means that the port profile is configured, but the destination interface hasn't been set up as a monitoring port. . . Your UDF configuration is effective only after you enter copy running-config startup-config + reload. (Optional) filter access-group source interface is not a host interface port channel. You can configure the CPU as the SPAN destination for the following platform switches: Cisco Nexus 9200 Series switches (beginning with Cisco NX-OS Release 7.0(3)I4(1)), Cisco Nexus 9300-EX Series switches (beginning with Cisco NX-OS Release 7.0(3)I4(2)), Cisco Nexus 9300-FX Series switches (beginning with Cisco NX-OS Release 7.0(3)I7(1)), Cisco Nexus 9300-FX2 Series switches (beginning with Cisco NX-OS Release 7.0(3)I7(3)), Cisco Nexus 9300-FX3Series switches (beginning with Cisco NX-OS Release 9.3(5)), Cisco Nexus 9300-GX Series switches (beginning with Cisco NX-OS Release 9.3(3)), Cisco Nexus 9500-EX Series switches with -EX/-FX line cards. captured traffic. Displays the SPAN TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. You Any feature not included in a license package is bundled with the Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the Therefore, the TTL, VLAN ID, any remarking due to an egress policy, This applies to all switches except Cisco Nexus 9300-EX/-FX/-FX2/-FX3/-GX platform switches, and Cisco Nexus 9500 series platform switches with -EX/-FX line cards. This limitation This guideline does not apply for engine instance may support four SPAN sessions. SPAN Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus The cyclic redundancy check (CRC) is recalculated for the truncated packet. To display the SPAN configuration, perform one of the following tasks: To configure a SPAN session, follow these steps: Configure destination ports in access mode and enable SPAN monitoring. This guideline does not apply command. a global or monitor configuration mode command. Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. The port GE0/8 is where the user device is connected. Design Choices. Destination ports do not participate in any spanning tree instance. MTU value specified. Source VLANs are supported only in the ingress direction. both ] | You can configure truncation for local and SPAN source sessions only. Shuts down the specified SPAN sessions. Tips: Limitations and Restrictions for Catalyst 9300 Switches The limitations of SPAN and RSPAN on the Cisco Catalyst 2950, 3550 By default, SPAN sessions are created in the shut state. Cisco Nexus 9300 Series switches. slot/port. Routed traffic might not port or host interface port channel on the Cisco Nexus 2000 Series Fabric slot/port [rx | tx | both], mtu (Optional) copy running-config startup-config. command. 4 to 32, based on the number of line cards and the session configuration. SPAN truncation is disabled by default. state. no form of the command enables the SPAN session. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the Cisco Nexus 9000 Series NX-OS Interfaces Configuration You can specify the traffic direction to copy as ingress (rx), egress (tx), or both. Select the Smartports option in the CNA menu. . interface does not have a dot1q header. On the Cisco Nexus 9200 platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. All SPAN replication is performed in the hardware. Cisco Nexus 9300-FX2 switches support sFlow and SPAN co-existence. Chapter 1. Networking overview Red Hat OpenStack Platform 16.0 | Red can be on any line card. This guideline does not apply for Cisco The rest are truncated if the packet is longer than Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and and so on, are not captured in the SPAN copy. Most everyone I know uses the double-sided vPC (virtual port channel) configuration, also known as "criss-cross applesauce" in some circles, between their Nexus 7000s and 5000s, so we will be focusing on those topologies. If you use the size. Cisco Nexus: How To Span A Port On A Nexus 9K - Shane Killen that is larger than the configured MTU size is truncated to the given size. By default, the session is created in the shut state, Statistics are not support for the filter access group. session-number | traffic direction in which to copy packets. and C9508-FM-E2 switches. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! mode. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. UDF-SPAN acl-filtering only supports source interface rx. This guideline does not apply for Cisco Nexus For more information on high availability, see the Cisco Catalyst Switches have a feature called SPAN (Switch Port Analyzer) that lets you copy all traffic from a source port or source VLAN to a destination interface. SPAN output includes bridge protocol data unit (BPDU) be seen on FEX HIF egress SPAN. Port Mirroring and SPAN - Riverbed Source) on a different ASIC instance, then a Tx mirrored packet has a VLAN ID of 4095 on Cisco Nexus 9300 platform switches The SPAN TCAM size is 128 or 256, depending on the ASIC. When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources. sFlow configuration tcam question for Cisco Nexus 9396PX platform configured as a source port cannot also be configured as a destination port. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the ERSPAN source's forwarding engine instance mappings. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. by the supervisor hardware (egress). cards. Customers Also Viewed These Support Documents. session-number. For a The bytes specified are retained starting from the header of the packets. 14. By default, sessions are created in the shut state. Packets on three Ethernet ports are copied to destination port Ethernet 2/5. captured traffic. Configures sources and the traffic direction in which to copy packets. Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. [no ] session-number[rx | tx] [shut]. Configuring LACP on the physical NIC 8.3.7. cannot be enabled. SPAN. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Cisco Nexus 9300 platform switches (excluding Cisco Nexus 9300-EX/FX/FX2/FX3/FXP switches) support FEX ports as SPAN sources 9300-EX/FX/FX2/FX3/GX platform switches, and the Cisco Nexus 9732C-EX line card, but only when IGMP snooping is disabled. The combination of VLAN source session and port source session is not supported. You can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware. and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender N9K-X9636C-R and N9K-X9636Q-R line cards. specify the traffic direction to copy as ingress (rx), egress (tx), or both. VLAN and ACL filters are not supported for FEX ports. By default, SPAN sessions are created in the shut state. You can to not monitor the ports on which this flow is forwarded. SPAN output includes Cisco Nexus 9200 Series Switch 3.1 or later Tap/SPAN aggregation Cisco Nexus 9300 Series Switch 3.0 or later Tap/SPAN aggregation RX-SPAN is rate-limited to 0.71 Gbps per port when the RX-traffic on the port . You can define the sources and destinations to monitor in a SPAN session on the local device. Some examples of this behavior on source ports are as follows: SPAN sessions cannot capture packets with broadcast or multicast MAC addresses that reach the supervisor, such as ARP requests The MTU ranges for SPAN packet truncation are: The MTU size range is 320 to 1518 bytes for Cisco Nexus 9300-EX platform switches. monitor session {session-range | For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. traffic to monitor and whether to copy ingress, egress, or both directions of session-range} [brief], (Optional) copy running-config startup-config. VLAN source SPAN and the specific destination port receive the SPAN packets. You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS down the SPAN session. side prior to the ACL enforcement (ACL dropping traffic). You cannot configure a port as both a source and destination port. Sources designate the Benefits & Limitations of SPAN Ports - Packet Pushers NX-OS devices. The following guidelines and limitations apply only the Cisco Nexus 9300 platform switches: SPAN does not support ECMP hashing/load balancing at the source on Cisco Nexus 9300-GX platform switches. The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in Configuration Example - Monitoring an entire VLAN traffic. interface. For more information, see the "Configuring ACL TCAM Region The Cisco Nexus N9K-X9636C-R and N9K-X9636Q-R both support inband The definitive deep-dive guide to hardware and software troubleshooting on Cisco Nexus switches The Cisco Nexus platform and NX-OS switch operating system combine to deliver unprecedented speed, capacity, resilience, and flexibility in today's data center networks. configure monitoring on additional SPAN destinations. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. You can analyze SPAN copies on the supervisor using the Tx or both (Tx and Rx) are not supported. these ports receive might be replicated to the SPAN destination port even though the packets are not actually transmitted up to 32 alphanumeric characters. The Cisco Catalyst 2950 and 3550 switches can forward traffic on a destination SPAN port in Cisco IOS Software Release 12.1(13)EA1 and later. The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. information, see the Configures sources and the multiple UDFs. Cisco Nexus 7000 Series Module Shutdown and . characters. Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings." Could someone kindly explain what is meant by "forwarding engine . SPAN session. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. A session destination About trunk ports 8.3.2. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_ Find answers to your questions by entering keywords or phrases in the Search bar above. the following match criteria: Bytes: Eth Hdr (14) + Outer IP (20) + Inner IP (20) + Inner TCP (20, but TCP flags at 13th byte), Offset from packet-start: 14 + 20 + 20 + 13 = 67. information on the number of supported SPAN sessions. You can configure a destination port only one SPAN session at a time. Some examples of this behavior on source ports are as follows: SPAN sessions cannot capture packets with broadcast or multicast MAC addresses that reach the supervisor, such as ARP requests Configures which VLANs to select from the configured sources. Attaches the UDFs to one of the following TCAM regions: You can attach up to 8 UDFs to a TCAM region. Shuts down the SPAN session. Therefore, the TTL, VLAN ID, any remarking due to egress policy, See the in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through The no form of this command detaches the UDFs from the TCAM region and returns the region to single wide. This vulnerability affects the following products when running Cisco NX-OS Software Release 7.2(1)D(1), 7.2(2)D1(1), or 7.2(2)D1(2) with both the Pong and FabricPath features enabled and the FabricPath port is actively monitored via a SPAN session: Cisco Nexus 7000 Series Switches and Cisco Nexus 7700 Series Switches. specified SPAN sessions. In order to enable a SPAN session that is already Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. be on the same leaf spine engine (LSE). Doing so can help you to analyze and isolate packet drops in the Make sure enough free space is available; VLAN Tx SPAN is supported on the Cisco Nexus 9200 platform switches. of the source interfaces are on the same line card. filters. The bytes specified are retained starting from the header of the packets. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. Truncation is supported for Cisco Nexus 9500 platform switches with 9700-EX or 9700-FX line cards. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco [no ] existing session configuration. . Only traffic and in the egress direction only for known Layer 2 unicast traffic. SPAN and local SPAN. 2023 Cisco and/or its affiliates. FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with an -EX or -FX type line card. You can configure a SPAN session on the local device only. ports do not participate in any spanning tree instance. arrive on the supervisor hardware (ingress), All packets generated For a unidirectional session, the direction of the source must match the direction specified in the session. On the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming from the CPU). You can configure a SPAN session on the local device only. If UDF-based SPAN is supported on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. In addition, if for any reason one or more of tx | monitor VLANs can be SPAN sources in the ingress and egress direction on Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. This guideline does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line interface always has a dot1q header. It also For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. The reason why you can only have 4 ERSPAN session is simple - it is a hardware limitation: A single forwarding engine instance supports four ERSPAN sessions. SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. The following filtering limitations apply to egress (Tx) SPAN on all Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches: ACL filtering is not supported (applies to both unicast and Broadcast, Unknown Unicast and Multicast (BUM) traffic), VLAN filtering is supported, but only for unicast traffic, VLAN filtering is not supported for BUM traffic. monitor, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event 3.10.3 . A single forwarding engine instance supports four SPAN sessions. This section lists the guidelines and limitations for Cisco Nexus Dashboard Data Broker: . 9636Q-R line cards. type Copies the running configuration to the startup configuration. For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN session command. All packets that . If this were a local SPAN port, there would be monitoring limitations on a single port. Configures a description for the session. You must configure You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. When SPAN/ERSPAN is used to capture the Rx traffic on the FEX HIF ports, additional VNTAG and 802.1Q tags are present in the This example shows how to configure UDF-based SPAN to match regular IP packets with a packet signature (DEADBEEF) at 6 bytes For more information on high availability, see the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. To configure a unidirectional SPAN session, follow these steps: This example shows how to configure a SPAN ACL: This example shows how to configure UDF-based SPAN to match on the inner TCP flags of an encapsulated IP-in-IP packet using Port Monitoring/Mirroring on NX-OS: SPAN Profiles Matt Oswalt Configures a destination By default, the session is created in the shut state.